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MATHEMATICS (714 journals)            First | 1 2 3 4     

Showing 601 - 538 of 538 Journals sorted alphabetically
Research in the Mathematical Sciences     Open Access  
Research Journal of Pure Algebra     Open Access   (Followers: 1)
Researches in Mathematics     Open Access  
Results in Control and Optimization     Open Access  
Results in Mathematics     Hybrid Journal  
Results in Nonlinear Analysis     Open Access  
Review of Symbolic Logic     Full-text available via subscription   (Followers: 2)
Reviews in Mathematical Physics     Hybrid Journal   (Followers: 1)
Revista Baiana de Educação Matemática     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista BoEM - Boletim online de Educação Matemática     Open Access  
Revista Colombiana de Matemáticas     Open Access   (Followers: 1)
Revista de Ciencias     Open Access  
Revista de Educación Matemática     Open Access  
Revista de la Escuela de Perfeccionamiento en Investigación Operativa     Open Access  
Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas     Partially Free  
Revista de Matemática : Teoría y Aplicaciones     Open Access   (Followers: 1)
Revista Digital: Matemática, Educación e Internet     Open Access  
Revista Electrónica de Conocimientos, Saberes y Prácticas     Open Access  
Revista Integración : Temas de Matemáticas     Open Access  
Revista Internacional de Sistemas     Open Access  
Revista Latinoamericana de Etnomatemática     Open Access  
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access  
Revista Matemática Complutense     Hybrid Journal  
Revista REAMEC : Rede Amazônica de Educação em Ciências e Matemática     Open Access  
Revista SIGMA     Open Access  
Ricerche di Matematica     Hybrid Journal  
RMS : Research in Mathematics & Statistics     Open Access  
Royal Society Open Science     Open Access   (Followers: 7)
Russian Journal of Mathematical Physics     Full-text available via subscription  
Russian Mathematics     Hybrid Journal  
Sahand Communications in Mathematical Analysis     Open Access  
Sampling Theory, Signal Processing, and Data Analysis     Hybrid Journal  
São Paulo Journal of Mathematical Sciences     Hybrid Journal  
Science China Mathematics     Hybrid Journal   (Followers: 1)
Science Progress     Full-text available via subscription   (Followers: 1)
Sciences & Technologie A : sciences exactes     Open Access  
Selecta Mathematica     Hybrid Journal   (Followers: 1)
SeMA Journal     Hybrid Journal  
Semigroup Forum     Hybrid Journal   (Followers: 1)
Set-Valued and Variational Analysis     Hybrid Journal  
SIAM Journal on Applied Mathematics     Hybrid Journal   (Followers: 11)
SIAM Journal on Computing     Hybrid Journal   (Followers: 11)
SIAM Journal on Control and Optimization     Hybrid Journal   (Followers: 18)
SIAM Journal on Discrete Mathematics     Hybrid Journal   (Followers: 8)
SIAM Journal on Financial Mathematics     Hybrid Journal   (Followers: 3)
SIAM Journal on Mathematics of Data Science     Hybrid Journal   (Followers: 1)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 3)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 12)
Siberian Advances in Mathematics     Hybrid Journal  
Siberian Mathematical Journal     Hybrid Journal  
Sigmae     Open Access  
SILICON     Hybrid Journal  
SN Partial Differential Equations and Applications     Hybrid Journal  
Soft Computing     Hybrid Journal   (Followers: 7)
Statistics and Computing     Hybrid Journal   (Followers: 14)
Stochastic Analysis and Applications     Hybrid Journal   (Followers: 3)
Stochastic Partial Differential Equations : Analysis and Computations     Hybrid Journal   (Followers: 2)
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 6)
Stochastics and Dynamics     Hybrid Journal   (Followers: 2)
Studia Scientiarum Mathematicarum Hungarica     Full-text available via subscription   (Followers: 1)
Studia Universitatis Babeș-Bolyai Informatica     Open Access  
Studies In Applied Mathematics     Hybrid Journal   (Followers: 1)
Studies in Mathematical Sciences     Open Access   (Followers: 1)
Superficies y vacio     Open Access  
Suska Journal of Mathematics Education     Open Access   (Followers: 1)
Swiss Journal of Geosciences     Hybrid Journal   (Followers: 1)
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Mathematics and Statistics     Full-text available via subscription   (Followers: 1)
Tamkang Journal of Mathematics     Open Access  
Tatra Mountains Mathematical Publications     Open Access  
Teaching Mathematics     Full-text available via subscription   (Followers: 10)
Teaching Mathematics and its Applications: An International Journal of the IMA     Hybrid Journal   (Followers: 4)
Teaching Statistics     Hybrid Journal   (Followers: 8)
Technometrics     Full-text available via subscription   (Followers: 8)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Mathematica journal     Open Access  
The Mathematical Gazette     Full-text available via subscription   (Followers: 1)
The Mathematical Intelligencer     Hybrid Journal  
The Ramanujan Journal     Hybrid Journal  
The VLDB Journal     Hybrid Journal   (Followers: 2)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 7)
Theory and Applications of Graphs     Open Access  
Topological Methods in Nonlinear Analysis     Full-text available via subscription  
Transactions of the London Mathematical Society     Open Access   (Followers: 1)
Transformation Groups     Hybrid Journal  
Turkish Journal of Mathematics     Open Access  
Ukrainian Mathematical Journal     Hybrid Journal  
Uniciencia     Open Access  
Uniform Distribution Theory     Open Access  
Unisda Journal of Mathematics and Computer Science     Open Access  
Unnes Journal of Mathematics     Open Access   (Followers: 1)
Unnes Journal of Mathematics Education     Open Access   (Followers: 2)
Unnes Journal of Mathematics Education Research     Open Access   (Followers: 1)
Ural Mathematical Journal     Open Access  
Vestnik Samarskogo Gosudarstvennogo Tekhnicheskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki     Open Access  
Vestnik St. Petersburg University: Mathematics     Hybrid Journal  
VFAST Transactions on Mathematics     Open Access   (Followers: 1)
Vietnam Journal of Mathematics     Hybrid Journal  
Vinculum     Full-text available via subscription  
Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics     Open Access   (Followers: 2)
Water SA     Open Access   (Followers: 1)
Water Waves     Hybrid Journal  
Zamm-Zeitschrift Fuer Angewandte Mathematik Und Mechanik     Hybrid Journal   (Followers: 1)
ZDM     Hybrid Journal   (Followers: 2)
Zeitschrift für angewandte Mathematik und Physik     Hybrid Journal   (Followers: 2)
Zeitschrift fur Energiewirtschaft     Hybrid Journal  
Zetetike     Open Access  

  First | 1 2 3 4     

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Russian Journal of Mathematical Physics
Journal Prestige (SJR): 0.696
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 1061-9208 - ISSN (Online) 1555-6638
Published by Springer-Verlag Homepage  [2469 journals]
  • Dirac Operators on Infinite Quantum Graphs

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      Abstract: We study quantum graphs \(\Gamma\) with a finite or countable set \(\mathcal{E}\) of edges equipped with the Dirac operators $$\mathfrak{D}_{\Gamma,Q}=J\frac{d}{dx}+Q,J=\left( \begin{array} [c]{cc} 0 & -1\\ 1 & 0 \end{array} \right) ,$$ where $$\begin{aligned} \, Q(x) & =\left( \begin{array} [c]{cc} p(x)+r(x) & q(x)\\ q(x) & -p(x)+r(x) \end{array} \right) ,\qquad p,q,r \in L^{\infty}(\Gamma). \end{aligned}$$ We consider the self-adjointness of the unbounded operator \(\ \mathcal{D} _{\Gamma,Q,\mathfrak{M}}\) in \(L^{2}(\Gamma,\mathbb{C}^{2})\) generated by the Dirac operators \(\mathfrak{D}_{\Gamma;Q}\) with domains consisting of spinors $$u(x)=\left( \begin{array} [c]{c} u^{1}(x)\\ u^{2}(x) \end{array} \right) \in H^{1}(\Gamma,\mathbb{C}^{2}).$$ and with the coupling conditions on the vertices \(v\in\mathcal{V}\) , $$\mathfrak{M}u(v)=\mathfrak{a}_{1}(v)u^{1}(v)+\mathfrak{a}_{2}(v)u^{2} (v)=0,v\in\mathcal{V}. \qquad\qquad\qquad\qquad (1)$$ Applying the method of limit operators, we describe the essential spectra of operators \(\mathcal{D}_{\Gamma,Q,\mathfrak{M}}\) on the graphs with finite sets of exits to infinity and also on periodic graphs with aperiodic potentials and aperiodic coupling conditions.
      PubDate: 2022-09-01
       
  • Triviality Theorem for Quasirepresentations in Reflexive Banach Spaces

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      Abstract: It is proved that, for a sufficiently small defect of a (not necessarily bounded) quasirepresentations of an amenable group in a reflexive Banach space with dense set of bounded orbits, there is an extension of this quasirepresentation for which there is a close ordinary representation of the group in the space of this extension.
      PubDate: 2022-09-01
       
  • Bifurcations of Essential Spectra Generated by a Small Non-Hermitian Hole.
           II. Eigenvalues and Resonances

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      Abstract: The paper focuses on bifurcations that occur in the essential spectrum of certain non-Hermitian operators. We consider an eigenvalue problem for an elliptic differential operator in a multidimensional tube-like domain which is infinite along one dimension and can be bounded or unbounded in other dimensions. This self-adjoint eigenvalue problem is perturbed by a small hole cut out of the domain. The boundary of the hole is described by a non-Hermitian Robin-type boundary condition. Our main result consists in sufficient conditions ensuring that this singular and non-Hermitian perturbation results in discrete eigenvalues or resonances bifurcating either from the edge or from certain internal points of the essential spectrum of the unperturbed problem. The location of the bifurcating eigenvalues and resonances is described in terms of asymptotic expansions with respect to the small linear size of the hole. Several illustrative examples are discussed.
      PubDate: 2022-09-01
       
  • Hamiltonian Systems with a Functional Parameter in the Form of a Potential

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      Abstract: Let \(T=T(h)\) be a real-analytic at \(0\in \mathbb{R} \) function, \(T(0)=\pi\) . Let \(H(x,y) = x^2+y^2 + {\cal O} _4(x,y)\) be a real-analytic at \(0\in \mathbb{R} ^2\) even function. We prove that there exists a real-analytic \( \varphi = \varphi (x) = {\cal O} _4(x)\) even function such that any solution of the Hamiltonian equations $$\dot x = \partial_y(H + \varphi ), \quad \dot y = - \partial_x(H + \varphi )$$ near the origin on the energy level \(h>0\) has the period \(T(h)\) . We discuss motivations and possible generalizations of this result.
      PubDate: 2022-09-01
       
  • On the Instability of Monotone Traveling-Wave Solutions for a Generalized
           Korteweg–de Vries–Burgers Equation

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      Abstract: For a generalized Korteweg–de Vries–Burgers equation with a flux function having two inflection points, we construct an example in which three different monotone structures of nonclassical (special) discontinuities, or undercompressive shocks, propagate at the same velocity. The linear stability of these structures is analyzed by applying the Evans function method. It is shown that some of them are neither linearly nor globally stable. The evolution of monotone unstable structures of undercompressive shocks is studied. The asymptotic behavior of the Evans function for large increments of perturbations is examined when the dissipation coefficient depends on the coordinate and time. A general approach to the construction of asymptotic expressions for the Evans function is described.
      PubDate: 2022-09-01
       
  • Degenerate Whitney Numbers of First and Second Kind of Dowling Lattices

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      Abstract: Dowling constructed the Dowling lattice \(Q_{n}(G)\) , for any finite set with \(n\) elements and any finite multiplicative group \(G\) of order \(m\) , which is a finite geometric lattice. He also defined the Whitney numbers of the first and second kind for any finite geometric lattice. These numbers for the Dowling lattice \(Q_{n}(G)\) are the Whitney numbers of the first kind \(V_{m}(n,k)\) and those of the second kind \(W_{m}(n,k)\) , which are given by Stirling number-like relations. In this paper, by ‘degenerating’ such relations we introduce the degenerate Whitney numbers of the first kind and those of the second kind and investigate, among other things, generating functions, recurrence relations and various explicit expressions for them. As further generalizations of the degenerate Whitney numbers of both kinds, we also consider the degenerate \(r\) -Whitney numbers of both kinds.
      PubDate: 2022-09-01
       
  • Solarity and Proximinality in Generalized Rational Approximation in Spaces
           $$C(Q)$$ and $$L^p$$

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      Abstract: The present paper is concerned with problems of solarity, proximinality, approximative compactness, stability, and monotone path-connectedness in generalized rational approximation in spaces \(L^p\) and \(C(Q)\) . Efficiency of the new approaches and concepts used in the paper is illustrated by a number of examples. Solar properties of sets of generalized rational functions in the space \(C(Q)\) are proved with the help of the new concept of \( \mathring B \) -complete sets: a closed set \(M\) is called \( \mathring B \) -complete if, for each \(x\in X\) and \(r>0\) , the condition \(M_0:= \mathring B (x,r)\cap M)\ne\varnothing\) implies that \( {}\kern.2em\overline{\kern-.2em M}{} _0 \supset M\cap B(x,r)\) . Existence and generalized approximative compactness in problems of generalized rational approximations in spaces \(C(Q)\) and \(L^p\) are proved using the new definition of algebraic completeness with the machinery of regular Deutsch convergence.
      PubDate: 2022-09-01
       
  • Functional-Difference Equations and Their Link with Perturbations of the
           Mehler Operator

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      Abstract: This work deals with the spectral properties of the functional-difference equations that arise in a number of applications in the diffraction of waves and quantum scattering. Their link with some of the spectral properties of perturbations of the Mehler operator is addressed. The latter naturally arise in studies of functional-difference equations of the second order with a meromorphic potential which depend on a characteristic parameter. In particular, this kind of equations is frequently encountered with in the asymptotic treatment of eigenfunctions of the Robin Laplacians in wedge- or cone-shaped domains. The unperturbed selfadjoint Mehler operator is studied by means of the modified Mehler–Fock transform. Its resolvent and spectral measure are described. These results are obtained by use of some additional analysis applied to the known Mehler formulas. For a class of compact perturbations of this operator, sufficient conditions of existence and finiteness of the discrete spectrum are then discussed. Applications to the functional-difference equations are also addressed. An example of a problem leading to the study of the spectral properties for a functional-difference equation is considered. The corresponding eigenfunctions and characteristic values are found explicitly in this case.
      PubDate: 2022-09-01
       
  • Continuity Criterion for Locally Bounded Finite-Dimensional
           Representations of Simply Connected Solvable Lie Groups

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      Abstract: We prove a continuity criterion for locally bounded finite-dimensional representations of simply connected solvable Lie groups.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020066
       
  • Topological and Frame Properties of Certain Pathological $$C^*$$ -Algebras

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      Abstract: We introduce a classification of locally compact Hausdorff topological spaces with respect to the behavior of \( \sigma \) -compact subsets and, relying on this classification, we study properties of the corresponding \(C^*\) -algebras in terms of frame theory and the theory of \( {\mathscr A} \) -compact operators in Hilbert \(C^*\) -modules; some pathological examples are constructed.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020029
       
  • Bounds for the Kolmogorov Widths of the Sobolev Weighted Classes with
           Conditions on the Zero and Highest Derivatives

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      Abstract: In this paper, order estimates for the Kolmogorov widths of sets defined by restrictions on the norm in the Sobolev weighted space \(W^r_{p_1}\) and the weighted space \(L_{p_0}\) are obtained.
      PubDate: 2022-06-01
      DOI: 10.1134/S106192082202008X
       
  • Geometry of the Singular Set of Hypersurfaces and the Eikonal Equation

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      Abstract: The paper is concerned with singularities of classical solutions to the eikonal equation. With this aim in view, we study the relation between the geometry of hypersurfaces and the set of singular points of its distance function from both sides of this hypersurface. We also give an algorithm for the construction of reflection caustics and compare the results and illustrations of mathematical simulation with real-world images.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020078
       
  • New Integral Representations for the Maslov Canonical Operator on an
           Isotropic Manifold with a Complex Germ

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      Abstract: The objective of our paper is to generalize the representation obtained in 2017 by S.Yu. Dobrokhotov, V.E. Nazaikinskii, and A.I. Shafarevich to the general case of the canonical operator on an isotropic manifold with complex germ.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020030
       
  • Existence of Contrast Structures in a Problem with Discontinuous Reaction
           and Advection

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      Abstract: In the paper, a boundary value problem for a singularly perturbed reaction-diffusion-advection equation is considered in a two-dimensional domain in the case of discontinuous coefficients of reaction and advection, whose discontinuity occurs on a predetermined curve lying in the domain. It is shown that this problem has a solution with a sharp internal transition layer localized near the discontinuity curve. For this solution, an asymptotic expansion in a small parameter is constructed, and also sufficient conditions are obtained for the input data of the problem under which the solution exists. The proof of the existence theorem is based on the asymptotic method of differential inequalities. It is also shown that a solution of this kind is Lyapunov asymptotically stable and locally unique. The results of the paper can be used to create mathematical models of physical phenomena at the interface between two media with different characteristics, as well as for the development of numerical-analytical methods for solving singularly perturbed problems.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020042
       
  • Index of Differential-Difference Operators on an Infinite Cylinder

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      Abstract: Differential-difference operators are considered on an infinite cylinder. The objective of the paper is to present an index formula for the operators in question. We define the operator symbol as a triple consisting of an internal symbol and conormal symbols on plus and minus infinity. The conormal symbols are families of operators with a parameter and periodic coefficients. Our index formula contains three terms: the contribution of the internal symbol on the base manifold, expressed by an analog of the Atiyah–Singer integral, the contributions of the conormal symbols at infinity, described in terms of the \(\eta\) -invariant, and also the third term, which also depends on the conormal symbol. The result thus obtained generalizes the Fedosov–Schulze–Tarkhanov formula.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020091
       
  • Inverse Spectral Problem for Band Operators and Their Sparsity Criterion
           In Terms of Inverse Problem Data

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      Abstract: We consider certain classes of operators generated by infinite band matrices (called band operators). They can be applied to the integration via the Lax pair formalism of nonlinear dynamical systems (e.g., Volterra type lattices) by using the inverse problem theory, in particular, by the inverse spectral problem method. A key role in this method is played by the moments of the Weyl matrix of a given band operator, which are used for unique reconstruction of the latter. These band operators have a special sparse structure, namely, they contain only two nonzero diagonals. We find a description of their sparsity in terms of these moments.
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020054
       
  • Asymptotics of the Solution of the Cauchy Problem with Localized Initial
           Conditions for a Wave Type Equation with Time Dispersion. I. Basic
           Structures

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      Abstract: In many physical problems describing the propagation of waves, there are dispersion effects, both spatial and temporal. In these cases, the equations describing these problems and relating the temporal frequency and spatial momenta turn out to be inhomogeneous with respect to these variables. At the same time, these relations are even not polynomial. An example with time dispersion is given by Maxwell’s equations in a situation with rapidly changing electric and magnetic fields; then the second time derivative \(t\) is replaced by a function of this derivative (a pseudodifferential operator). In the paper, asymptotic formulas are constructed for the solution of the Cauchy problem with localized initial data for the equation \(g^2\bigl(-ih\frac{\partial}{\partial t}\bigr)u=-h^2\langle \nabla,\, c^2(x)\nabla\rangle u\) with variable speed and a small parameter characterizing fast oscillations of the propagating waves. One of the main considerations in use is that the constructive asymptotics for the solution of problems of this type are represented by functions given parametrically, and the corresponding parameters are the natural coordinates on the Lagrangian manifolds defining these asymptotics. Here, in contrast to problems with spatial dispersion, the corresponding Lagrangian manifold is defined in the phase space containing the time \(t\) and the corresponding conjugate momentum coordinate, the frequency \(\omega\) .
      PubDate: 2022-06-01
      DOI: 10.1134/S1061920822020017
       
  • Continuity Criterion for Locally Bounded Automorphisms of Central
           Extensions of Perfect Lie Groups with Discrete Center

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      Abstract: We prove that every locally bounded automorphism of a connected not necessarily linear Lie central extension of a connected perfect Lie group with discrete center is continuous if and only if it is continuous on the center.
      PubDate: 2022-03-01
      DOI: 10.1134/S1061920822010113
       
  • On a Nonlinear Nonlocal Parabolic Problem

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      Abstract: We consider the Cauchy problem for a parabolic equation with a Ё-Laplacian or a general second-order quasilinear equation with boundary conditions of the Bitsadze–Samarskii type. We prove that at least one generalized solution of such problem exists.
      PubDate: 2022-03-01
      DOI: 10.1134/S1061920822010125
       
  • Integrable Hamiltonian Systems on the Symplectic Realizations of
           $$\textbf{e}(3)^*$$

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      Abstract: The phase space of a gyrostat with a fixed point and a heavy top is the Lie–Poisson space \(\textbf{e}(3)^*\cong \mathbb{R}^3\times \mathbb{R}^3\) dual to the Lie algebra \(\textbf{e}(3)\) of the Euclidean group \(E(3)\) . One has three naturally distinguished Poisson submanifolds of \(\textbf{e}(3)^*\) : (i) the dense open submanifold \(\mathbb{R}^3\times \dot{\mathbb{R}}^3\subset \textbf{e}(3)^*\) which consists of all \(4\) -dimensional symplectic leaves ( \(\vec{\Gamma}^2>0\) ); (ii) the \(5\) -dimensional Poisson submanifold of \(\mathbb{R}^3\times \dot{\mathbb{R}}^3\) defined by \(\vec{J}\cdot \vec{\Gamma} = \mu \vec{\Gamma} \) ; (iii) the \(5\) -dimensional Poisson submanifold of \(\mathbb{R}^3\times \dot{\mathbb{R}}^3\) defined by \(\vec{\Gamma}^2 = \nu^2\) , where \(\dot{\mathbb{R}}^3:= \mathbb{R}^3\backslash \{0\}\) , \((\vec{J}, \vec{\Gamma})\in \mathbb{R}^3\times \mathbb{R}^3\cong \textbf{e}(3)^*\) and \(\nu < 0 \) , \(\mu\) are some fixed real parameters. Using the \(U(2,2)\) -invariant symplectic structure of Penrose twistor space we find full and complete \(E(3)\) -equivariant symplectic realizations of these Poisson submanifolds which are \(8\) -dimensional for (i) and \(6\) -dimensional for (ii) and (iii). As a consequence of the above, Hamiltonian systems on \(\textbf{e}(3)^*\) lift to Hamiltonian systems on the above symplectic realizations. In this way, after lifting the integrable cases of a gyrostat with a fixed point and of a heavy top, we obtain a large family of integrable Hamiltonian systems on the phase spaces defined by these symplectic realizations.
      PubDate: 2022-03-01
      DOI: 10.1134/S1061920822010095
       
 
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